針對傳統(tǒng)Z 源逆變器存在的一些缺陷，有文獻研究了Z 源逆變器拓撲的改進問題，目前存在兩種改進的Z 源逆變器拓撲。其中一種將輸入電源插入到Z 源網(wǎng)絡中，帶來的優(yōu)點是輸入電流連續(xù)，并可以減小其中一個電容的耐壓；另一種輸入電源與負載位于同一側，可以減小Z 源電容的電壓，并可以實現(xiàn)變換器的軟啟動。本文在分析改進拓撲穩(wěn)態(tài)工作原理的基礎上，對三種拓撲進行了對比分析，并給出了仿真和實驗研究的結果，驗證了理論分析的正確性。
Abstract: To solve the problem of the traditional Z-source inverter, two improved Z-source inverters are presented. In one improved topology, the DC source is in series with the Z-inductor. Compared to the traditional one, it features lower dc voltage across one of the Z-capacitors and continuous input current; the other could reduce the dc voltage across Z-source capacitors evidently, thus low voltage capacitors can be utilized to reduce the system cost and volume. Theoretical analysis, simulation and experimental results were presented to demonstrate the validity of the theory.
關鍵詞：Z 源逆變器，調(diào)制策略，沖擊電流
Key word: Z-source inverter, modulation scheme, inrush current